#include <locale>
#include <sstream>
#include <iostream>
#include <stdexcept>
#include <string>

class my_num_put :
    public std::num_put< char >
{
public:
    explicit my_num_put(std::size_t n) : std::num_put< char >(n) {}

    iter_type do_put(iter_type, std::ios_base&, char_type, double) const
    {
        std::cout << "Throwing an exception" << std::endl;
        throw std::logic_error("my error");
    }
};

void test(std::ostream& strm)
{
    double x = 1.0;

    try
    {
        strm << x;

        if (!strm.good())
            std::cout << "Stream is not good" << std::endl;
    }
    catch (std::logic_error& e)
    {
        std::cout << "Caught logic_error: " << e.what() << std::endl;
    }
    catch (std::ios_base::failure& e)
    {
        std::cout << "Caught ios_base::failure: " << e.what() << std::endl;
    }
}

int main(int, char*[])
{
    std::ostringstream strm1;
    strm1.imbue(std::locale(std::locale::classic(), new my_num_put(0)));
    test(strm1);

    std::ostringstream strm2;
    strm2.imbue(std::locale(std::locale::classic(), new my_num_put(0)));
    strm2.exceptions(~std::ios_base::goodbit);
    test(strm2);

    return 0;
}